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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">BufRead</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;

<span class="kw">use</span> <span class="ident">memchr</span>::{<span class="ident">memchr</span>, <span class="ident">memchr2</span>, <span class="ident">memchr3</span>};

<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">ROOT_STATE</span>, <span class="ident">StateIdx</span>};

<span class="doccomment">/// An abstraction over automatons and their corresponding iterators.</span>
<span class="doccomment">/// The type parameter `P` is the type of the pattern that was used to</span>
<span class="doccomment">/// construct this Automaton.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> {
    <span class="doccomment">/// Return the next state given the current state and next character.</span>
    <span class="kw">fn</span> <span class="ident">next_state</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">StateIdx</span>;

    <span class="doccomment">/// Return true if and only if the given state and current pattern index</span>
    <span class="doccomment">/// indicate a match.</span>
    <span class="kw">fn</span> <span class="ident">has_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span>;

    <span class="doccomment">/// Build a match given the current state, pattern index and input index.</span>
    <span class="kw">fn</span> <span class="ident">get_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>, <span class="ident">texti</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">Match</span>;

    <span class="doccomment">/// Return the set of bytes that have transitions in the root state.</span>
    <span class="kw">fn</span> <span class="ident">start_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>];

    <span class="doccomment">/// Returns all of the patterns matched by this automaton.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The order of the patterns is the order in which they were added.</span>
    <span class="kw">fn</span> <span class="ident">patterns</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">P</span>];

    <span class="doccomment">/// Returns the pattern indexed at `i`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// The index corresponds to the position at which the pattern was added</span>
    <span class="doccomment">/// to the automaton, starting at `0`.</span>
    <span class="kw">fn</span> <span class="ident">pattern</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">P</span>;

    <span class="doccomment">/// Return the number of patterns in the automaton.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">patterns</span>().<span class="ident">len</span>()
    }

    <span class="doccomment">/// Returns true if the automaton has no patterns.</span>
    <span class="attribute">#[<span class="ident">inline</span>]</span>
    <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span>
    }

    <span class="doccomment">/// Returns an iterator of non-overlapping matches in `s`.</span>
    <span class="kw">fn</span> <span class="ident">find</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>,
        <span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s</span> <span class="ident">Q</span>,
    ) <span class="op">-&gt;</span> <span class="ident">Matches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="self">Self</span><span class="op">&gt;</span>
    <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
        <span class="ident">Matches</span> {
            <span class="ident">aut</span>: <span class="self">self</span>,
            <span class="ident">text</span>: <span class="ident">s</span>.<span class="ident">as_ref</span>(),
            <span class="ident">texti</span>: <span class="number">0</span>,
            <span class="ident">si</span>: <span class="ident">ROOT_STATE</span>,
            <span class="ident">_m</span>: <span class="ident">PhantomData</span>,
        }
    }

    <span class="doccomment">/// Returns an iterator of overlapping matches in `s`.</span>
    <span class="kw">fn</span> <span class="ident">find_overlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>,
        <span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s</span> <span class="ident">Q</span>,
    ) <span class="op">-&gt;</span> <span class="ident">MatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="self">Self</span><span class="op">&gt;</span>
    <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
        <span class="ident">MatchesOverlapping</span> {
            <span class="ident">aut</span>: <span class="self">self</span>,
            <span class="ident">text</span>: <span class="ident">s</span>.<span class="ident">as_ref</span>(),
            <span class="ident">texti</span>: <span class="number">0</span>,
            <span class="ident">si</span>: <span class="ident">ROOT_STATE</span>,
            <span class="ident">outi</span>: <span class="number">0</span>,
            <span class="ident">_m</span>: <span class="ident">PhantomData</span>,
        }
    }

    <span class="doccomment">/// Returns an iterator of non-overlapping matches in the given reader.</span>
    <span class="kw">fn</span> <span class="ident">stream_find</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>,
        <span class="ident">rdr</span>: <span class="ident">R</span>,
    ) <span class="op">-&gt;</span> <span class="ident">StreamMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="self">Self</span><span class="op">&gt;</span>
    <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
        <span class="ident">StreamMatches</span> {
            <span class="ident">aut</span>: <span class="self">self</span>,
            <span class="ident">buf</span>: <span class="ident">io</span>::<span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">rdr</span>),
            <span class="ident">texti</span>: <span class="number">0</span>,
            <span class="ident">si</span>: <span class="ident">ROOT_STATE</span>,
            <span class="ident">_m</span>: <span class="ident">PhantomData</span>,
        }
    }

    <span class="doccomment">/// Returns an iterator of overlapping matches in the given reader.</span>
    <span class="kw">fn</span> <span class="ident">stream_find_overlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="self">self</span>,
        <span class="ident">rdr</span>: <span class="ident">R</span>,
    ) <span class="op">-&gt;</span> <span class="ident">StreamMatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="self">Self</span><span class="op">&gt;</span>
    <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
        <span class="ident">StreamMatchesOverlapping</span> {
            <span class="ident">aut</span>: <span class="self">self</span>,
            <span class="ident">buf</span>: <span class="ident">io</span>::<span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">rdr</span>),
            <span class="ident">texti</span>: <span class="number">0</span>,
            <span class="ident">si</span>: <span class="ident">ROOT_STATE</span>,
            <span class="ident">outi</span>: <span class="number">0</span>,
            <span class="ident">_m</span>: <span class="ident">PhantomData</span>,
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">P</span>: <span class="ident">AsRef</span><span class="op">&lt;</span>[<span class="ident">u8</span>]<span class="op">&gt;</span>, <span class="ident">A</span>: <span class="lifetime">&#39;a</span> <span class="op">+</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>
        <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">A</span> {
    <span class="kw">fn</span> <span class="ident">next_state</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">b</span>: <span class="ident">u8</span>) <span class="op">-&gt;</span> <span class="ident">StateIdx</span> {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">b</span>)
    }

    <span class="kw">fn</span> <span class="ident">has_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="ident">outi</span>)
    }

    <span class="kw">fn</span> <span class="ident">start_bytes</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">u8</span>] {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">start_bytes</span>()
    }

    <span class="kw">fn</span> <span class="ident">patterns</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span>[<span class="ident">P</span>] {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">patterns</span>()
    }

    <span class="kw">fn</span> <span class="ident">pattern</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="kw-2">&amp;</span><span class="ident">P</span> {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">pattern</span>(<span class="ident">i</span>)
    }

    <span class="kw">fn</span> <span class="ident">get_match</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">si</span>: <span class="ident">StateIdx</span>, <span class="ident">outi</span>: <span class="ident">usize</span>, <span class="ident">texti</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">Match</span> {
        (<span class="kw-2">*</span><span class="kw-2">*</span><span class="self">self</span>).<span class="ident">get_match</span>(<span class="ident">si</span>, <span class="ident">outi</span>, <span class="ident">texti</span>)
    }
}

<span class="doccomment">/// Records a match in the search text.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Hash</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Match</span> {
    <span class="doccomment">/// The pattern index.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This corresponds to the ordering in which the matched pattern was</span>
    <span class="doccomment">/// added to the automaton, starting at `0`.</span>
    <span class="kw">pub</span> <span class="ident">pati</span>: <span class="ident">usize</span>,
    <span class="doccomment">/// The starting byte offset of the match in the search text.</span>
    <span class="kw">pub</span> <span class="ident">start</span>: <span class="ident">usize</span>,
    <span class="doccomment">/// The ending byte offset of the match in the search text.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// (This can be re-captiulated with `pati` and adding the pattern&#39;s</span>
    <span class="doccomment">/// length to `start`, but it is convenient to have it here.)</span>
    <span class="kw">pub</span> <span class="ident">end</span>: <span class="ident">usize</span>,
}

<span class="doccomment">/// An iterator of non-overlapping matches for in-memory text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator yields `Match` values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;a` is the lifetime of the automaton, `&#39;s` is the lifetime of the</span>
<span class="doccomment">/// search text, and `P` is the type of the Automaton&#39;s pattern.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Matches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="lifetime">&#39;a</span> <span class="op">+</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> {
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s</span> [<span class="ident">u8</span>],
    <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="ident">si</span>: <span class="ident">StateIdx</span>,
    <span class="ident">_m</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>,
}

<span class="comment">// When there&#39;s an initial lone start byte, it is usually worth it</span>
<span class="comment">// to use `memchr` to skip along the input. The problem is that</span>
<span class="comment">// the skipping function is called in the inner match loop, which</span>
<span class="comment">// can be quite costly if the skipping condition is never met.</span>
<span class="comment">// Therefore, we lift the case analysis outside of the inner loop at</span>
<span class="comment">// the cost of repeating code.</span>
<span class="comment">//</span>
<span class="comment">// `step_to_match` is the version of the inner loop without skipping,</span>
<span class="comment">// and `skip_to_match` is the version with skipping.</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">never</span>)]</span>
<span class="kw">fn</span> <span class="ident">step_to_match</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
    <span class="kw-2">mut</span> <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="kw-2">mut</span> <span class="ident">si</span>: <span class="ident">StateIdx</span>
) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">StateIdx</span>)<span class="op">&gt;</span> {
    <span class="kw">while</span> <span class="ident">texti</span> <span class="op">&lt;</span> <span class="ident">text</span>.<span class="ident">len</span>() {
        <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
        <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
            <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
        }
        <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
        <span class="kw">if</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">4</span> <span class="op">&lt;</span> <span class="ident">text</span>.<span class="ident">len</span>() {
            <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
            <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
            }
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
            <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
            }
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
            <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
            }
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
            <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
            }
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
            <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
                <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
            }
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
        }
    }
    <span class="prelude-val">None</span>
}

<span class="kw">fn</span> <span class="ident">skip_to_match</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span>, <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">A</span>, <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span><span class="op">&gt;</span>(
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
    <span class="kw-2">mut</span> <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="kw-2">mut</span> <span class="ident">si</span>: <span class="ident">StateIdx</span>,
    <span class="ident">skip</span>: <span class="ident">F</span>,
) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">StateIdx</span>)<span class="op">&gt;</span> {
    <span class="kw">if</span> <span class="ident">si</span> <span class="op">==</span> <span class="ident">ROOT_STATE</span> {
        <span class="ident">texti</span> <span class="op">=</span> <span class="ident">skip</span>(<span class="ident">aut</span>, <span class="ident">text</span>, <span class="ident">texti</span>);
    }
    <span class="kw">while</span> <span class="ident">texti</span> <span class="op">&lt;</span> <span class="ident">text</span>.<span class="ident">len</span>() {
        <span class="ident">si</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="ident">si</span>, <span class="ident">text</span>[<span class="ident">texti</span>]);
        <span class="kw">if</span> <span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="ident">si</span>, <span class="number">0</span>) {
            <span class="kw">return</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>));
        }
        <span class="kw">if</span> <span class="ident">si</span> <span class="op">==</span> <span class="ident">ROOT_STATE</span> {
            <span class="ident">texti</span> <span class="op">=</span> <span class="ident">skip</span>(<span class="ident">aut</span>, <span class="ident">text</span>, <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span>);
        } <span class="kw">else</span> {
            <span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
        }
    }
    <span class="prelude-val">None</span>
}

<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">skip1</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
    <span class="ident">at</span>: <span class="ident">usize</span>,
) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span>);
    <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">0</span>];
    <span class="kw">match</span> <span class="ident">memchr</span>(<span class="ident">b</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">at</span>..]) {
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">text</span>.<span class="ident">len</span>(),
        <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">at</span> <span class="op">+</span> <span class="ident">i</span>,
    }
}

<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">skip2</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
    <span class="ident">at</span>: <span class="ident">usize</span>,
) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span>);
    <span class="kw">let</span> (<span class="ident">b1</span>, <span class="ident">b2</span>) <span class="op">=</span> (<span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">0</span>], <span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">1</span>]);
    <span class="kw">match</span> <span class="ident">memchr2</span>(<span class="ident">b1</span>, <span class="ident">b2</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">at</span>..]) {
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">text</span>.<span class="ident">len</span>(),
        <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">at</span> <span class="op">+</span> <span class="ident">i</span>,
    }
}

<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">skip3</span><span class="op">&lt;</span><span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>],
    <span class="ident">at</span>: <span class="ident">usize</span>,
) <span class="op">-&gt;</span> <span class="ident">usize</span> {
    <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">3</span>);
    <span class="kw">let</span> (<span class="ident">b1</span>, <span class="ident">b2</span>, <span class="ident">b3</span>) <span class="op">=</span> (
        <span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">0</span>], <span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">1</span>], <span class="ident">aut</span>.<span class="ident">start_bytes</span>()[<span class="number">2</span>],
    );
    <span class="kw">match</span> <span class="ident">memchr3</span>(<span class="ident">b1</span>, <span class="ident">b2</span>, <span class="ident">b3</span>, <span class="kw-2">&amp;</span><span class="ident">text</span>[<span class="ident">at</span>..]) {
        <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="ident">text</span>.<span class="ident">len</span>(),
        <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=&gt;</span> <span class="ident">at</span> <span class="op">+</span> <span class="ident">i</span>,
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Matches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Match</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip1</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">ROOT_STATE</span>;
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="ident">si</span>, <span class="number">0</span>, <span class="ident">texti</span>));
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip2</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">ROOT_STATE</span>;
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="ident">si</span>, <span class="number">0</span>, <span class="ident">texti</span>));
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">3</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip3</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">ROOT_STATE</span>;
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="ident">si</span>, <span class="number">0</span>, <span class="ident">texti</span>));
            }
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">step</span> <span class="op">=</span> <span class="ident">step_to_match</span>(<span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">step</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span> <span class="op">+</span> <span class="number">1</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">ROOT_STATE</span>;
                <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="ident">si</span>, <span class="number">0</span>, <span class="ident">texti</span>));
            }
        }
        <span class="prelude-val">None</span>
    }
}

<span class="doccomment">/// An iterator of non-overlapping matches for streaming text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator yields `io::Result&lt;Match&gt;` values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;a` is the lifetime of the automaton, `R` is the type of the underlying</span>
<span class="doccomment">/// `io::Read`er, and P is the type of the Automaton&#39;s pattern.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StreamMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="lifetime">&#39;a</span> <span class="op">+</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> {
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">A</span>,
    <span class="ident">buf</span>: <span class="ident">io</span>::<span class="ident">BufReader</span><span class="op">&lt;</span><span class="ident">R</span><span class="op">&gt;</span>,
    <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="ident">si</span>: <span class="ident">StateIdx</span>,
    <span class="ident">_m</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;&gt;</span>
        <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">StreamMatches</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">consumed</span> <span class="op">=</span> <span class="number">0</span>;
<span class="lifetime">&#39;LOOP</span>:  <span class="kw">loop</span> {
            <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">consume</span>(<span class="ident">consumed</span>);
            <span class="kw">let</span> <span class="ident">bs</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">fill_buf</span>() {
                <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">err</span>)),
                <span class="prelude-val">Ok</span>(<span class="ident">bs</span>) <span class="kw">if</span> <span class="ident">bs</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">=&gt;</span> <span class="kw">break</span>,
                <span class="prelude-val">Ok</span>(<span class="ident">bs</span>) <span class="op">=&gt;</span> <span class="ident">bs</span>,
            };
            <span class="ident">consumed</span> <span class="op">=</span> <span class="ident">bs</span>.<span class="ident">len</span>(); <span class="comment">// is shortened if we find a match</span>
            <span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&amp;</span><span class="ident">b</span>) <span class="kw">in</span> <span class="ident">bs</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="ident">b</span>);
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="number">0</span>) {
                    <span class="ident">m</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="number">0</span>, <span class="self">self</span>.<span class="ident">texti</span>)));
                    <span class="ident">consumed</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>;
                    <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
                    <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">ROOT_STATE</span>;
                    <span class="kw">break</span> <span class="lifetime">&#39;LOOP</span>;
                }
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            }
        }
        <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">consume</span>(<span class="ident">consumed</span>);
        <span class="ident">m</span>
    }
}

<span class="doccomment">/// An iterator of overlapping matches for in-memory text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator yields `Match` values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;a` is the lifetime of the automaton, `&#39;s` is the lifetime of the</span>
<span class="doccomment">/// search text, and `P` is the type of the Automaton&#39;s pattern.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="lifetime">&#39;a</span> <span class="op">+</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> {
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">A</span>,
    <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;s</span> [<span class="ident">u8</span>],
    <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="ident">si</span>: <span class="ident">StateIdx</span>,
    <span class="ident">outi</span>: <span class="ident">usize</span>,
    <span class="ident">_m</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>
        <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">MatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;s</span>, <span class="ident">P</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Match</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
            <span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>, <span class="self">self</span>.<span class="ident">texti</span>);
            <span class="self">self</span>.<span class="ident">outi</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            }
            <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">m</span>);
        }

        <span class="self">self</span>.<span class="ident">outi</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip1</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">si</span>;
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">2</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip2</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">si</span>;
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        } <span class="kw">else</span> <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">start_bytes</span>().<span class="ident">len</span>() <span class="op">==</span> <span class="number">3</span> {
            <span class="kw">let</span> <span class="ident">skip</span> <span class="op">=</span> <span class="ident">skip_to_match</span>(
                <span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>, <span class="ident">skip3</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">skip</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">si</span>;
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        } <span class="kw">else</span> {
            <span class="kw">let</span> <span class="ident">step</span> <span class="op">=</span> <span class="ident">step_to_match</span>(<span class="self">self</span>.<span class="ident">aut</span>, <span class="self">self</span>.<span class="ident">text</span>, <span class="self">self</span>.<span class="ident">texti</span>, <span class="self">self</span>.<span class="ident">si</span>);
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>((<span class="ident">texti</span>, <span class="ident">si</span>)) <span class="op">=</span> <span class="ident">step</span> {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">=</span> <span class="ident">texti</span>;
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="ident">si</span>;
                <span class="kw">return</span> <span class="self">self</span>.<span class="ident">next</span>();
            }
        }
        <span class="prelude-val">None</span>
    }
}

<span class="doccomment">/// An iterator of overlapping matches for streaming text.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator yields `io::Result&lt;Match&gt;` values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `&#39;a` is the lifetime of the automaton, `R` is the type of the underlying</span>
<span class="doccomment">/// `io::Read`er, and P is the type of the Automaton&#39;s pattern.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StreamMatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="lifetime">&#39;a</span> <span class="op">+</span> <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span> {
    <span class="ident">aut</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> <span class="ident">A</span>,
    <span class="ident">buf</span>: <span class="ident">io</span>::<span class="ident">BufReader</span><span class="op">&lt;</span><span class="ident">R</span><span class="op">&gt;</span>,
    <span class="ident">texti</span>: <span class="ident">usize</span>,
    <span class="ident">si</span>: <span class="ident">StateIdx</span>,
    <span class="ident">outi</span>: <span class="ident">usize</span>,
    <span class="ident">_m</span>: <span class="ident">PhantomData</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span>, <span class="ident">P</span>, <span class="ident">A</span>: <span class="ident">Automaton</span><span class="op">&lt;</span><span class="ident">P</span><span class="op">&gt;</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>
        <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">StreamMatchesOverlapping</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">R</span>, <span class="ident">P</span>, <span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;</span>;

    <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Match</span><span class="op">&gt;&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
            <span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>, <span class="self">self</span>.<span class="ident">texti</span>);
            <span class="self">self</span>.<span class="ident">outi</span> <span class="op">+=</span> <span class="number">1</span>;
            <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            }
            <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">m</span>));
        }
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">consumed</span> <span class="op">=</span> <span class="number">0</span>;
        <span class="self">self</span>.<span class="ident">outi</span> <span class="op">=</span> <span class="number">0</span>;
<span class="lifetime">&#39;LOOP</span>:  <span class="kw">loop</span> {
            <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">consume</span>(<span class="ident">consumed</span>);
            <span class="kw">let</span> <span class="ident">bs</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">fill_buf</span>() {
                <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">err</span>)),
                <span class="prelude-val">Ok</span>(<span class="ident">bs</span>) <span class="kw">if</span> <span class="ident">bs</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">=&gt;</span> <span class="kw">break</span>,
                <span class="prelude-val">Ok</span>(<span class="ident">bs</span>) <span class="op">=&gt;</span> <span class="ident">bs</span>,
            };
            <span class="ident">consumed</span> <span class="op">=</span> <span class="ident">bs</span>.<span class="ident">len</span>(); <span class="comment">// is shortened if we find a match</span>
            <span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&amp;</span><span class="ident">b</span>) <span class="kw">in</span> <span class="ident">bs</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
                <span class="self">self</span>.<span class="ident">si</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">next_state</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="ident">b</span>);
                <span class="kw">if</span> <span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
                    <span class="ident">m</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">get_match</span>(
                        <span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>, <span class="self">self</span>.<span class="ident">texti</span>)));
                    <span class="ident">consumed</span> <span class="op">=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>;
                    <span class="self">self</span>.<span class="ident">outi</span> <span class="op">+=</span> <span class="number">1</span>;
                    <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">aut</span>.<span class="ident">has_match</span>(<span class="self">self</span>.<span class="ident">si</span>, <span class="self">self</span>.<span class="ident">outi</span>) {
                        <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
                    }
                    <span class="kw">break</span> <span class="lifetime">&#39;LOOP</span>;
                }
                <span class="self">self</span>.<span class="ident">texti</span> <span class="op">+=</span> <span class="number">1</span>;
            }
        }
        <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">consume</span>(<span class="ident">consumed</span>);
        <span class="ident">m</span>
    }
}
</pre>
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